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Finding the Fourth Proportional to 43.15, 64.40 and 39.97

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Solution

The fourth proportional to 43.15, 64.40 and 39.97 is: 59.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.15 : 64.40 = 39.97 : x
  2. Step 2: Convert to fraction form
    43.15/64.40 = 39.97/x
  3. Step 3: Cross multiply
    43.15x = 64.40 × 39.97
  4. Step 4: Simplify right side
    43.15x = 2,574.33
  5. Step 5: Solve for x
    x = 2,574.33/43.15
  6. Step 6: Final answer
    x = 59.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.